(2)
Both sources cannot be blocked o. simultaneously.

(h) For unpressurized rotorcraft,paragraph(g)(1) ofthis sectiondoes not applyifit canbe demonstrated that the staticpressure system calibration, when either static pressuresourceisselected,isnotchangedby the other staticpressuresourcebeing open or blocked.
Amdt. 29-24, E.. 12/6/84
FAR 29.1327 : Magnetic direction indicator.
(a)
Each magnetic direction indicator must be installed so that its accuracy is not ex-cessively a.ected by the rotorcraft’s vibration or magnetic .elds.

(b)
Thecompensatedinstallationmay nothaveadeviation,inlevel .ight,greaterthan 10 degrees on any heading.

FAR 29.1329 : Automatic pilot system.

(a)
Each automatic pilot system must be designed so that the automatic pilot can–

(1)
Besu.ciently overpoweredby onepilottoallowcontrol of the rotorcraft; and

(2)
Be readilyandpositivelydisengagedby eachpilot topreventitfrominterfering with the control of the rotorcraft.

(b)
Unless thereis automatic synchronization, eachsystem musthave a means to readily indicate to thepilot the alignment of the actuatingdevice in relation to the control system it operates.

(c)
Eachmanually operated controlfor the system’s operation mustbe readily accessible to the pilots.

(d)
The system must be designed and adjusted so that, within the range of adjustment available to the pilot, it cannot produce hazardous deviations in the .ight path, under any .ight condition appropriate to its use, either during normal operation or in the event of a malfunction, assuming that corrective action begins within a reasonableperiod of time.

(e)
If the automatic pilot integrates signals from auxiliary controls or furnishes signals for operationof other equipment,there mustbepositiveinterlocksand sequencing of engagement to prevent improper operation.

(f)
[If the automatic pilot system can be coupled to airborne navigation equipment, means must be provided to indicate to the pilots the current mode of operation. Selector switch position is not acceptable as a means of indication.]

Amdt. 29-42, E.. 9/8/98
FAR 29.1331 : Instruments using a power supply.
For category A rotorcraft–
(a) Each required .ight instrument using a power supply must have–
(1)
Two independent sources of power;

(2)
A means of selecting either power source; and

(3) [A visual means integral with each instrument to indicate when the power adequate to sustainproperinstrumentperformanceis notbeing supplied.The power must be measured at or near the point where it enters the instrument. For electrical instruments, the power is considered to be adequate when the voltageis withinthe approvedlimits; and]
(b) The installation and power supply system must be such that failure of any .ight instrument connected to one source, or of the energy supply from one source, or a fault in any part of the power distribution system does not interfere with the proper supply of energy from any other source.
Amdt. 29-24, E.. 12/6/84
FAR 29.1333 : Instrument systems.
[For systems that operate the required .ight instruments which are located at each pilot’s station, the following apply :
(a)
Only the required .ight instruments for the .rst pilot may be connected to that operating system.

(b)
The equipment, systems, and installations must be designed so that one display of the information essential to the safety of .ight which is provided by the .ight instruments remains available to a pilot, without additional crewmember action, after any singlefailure or combination offailuresthat are not showntobe extremely improbable.
　
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本文鏈接地址：FAA規章 美國聯邦航空規章 Federal Aviation Regulations 5(91)